Desculpa que não falo en português.
Sorry, my Portuguese is really little, I hope you understand English or my humble Spanish.
libgd is only needed for aMuleweb to dynamicly create the progress images. If you don't use amuleweb you won't need libgd.
Don't forget to install libgd-dev (or similar) if you want to compile with gd.
To compile with optimisations add the flag
--enable-optimize to your configure-command.
e.g.: ./configure --enable-optimize --disable-debug
Desculpa, mi portugues es muy malo, espero que comprendes inglés o mi español mala.
Solamente necesitas libgd para amuleweb por creer el imagenes de progreso. Si no usas amuleweb no necesitas libgd.
No olvida de instalar libgd-dev (o similar) si quieres compilar con gd.
Para compilar con optimizationes adjuntar --enable-optimize al mando configure.
saudação